CSI measurement method and apparatus

Abstract

This application provides a CSI measurement method and apparatus. In the method, a terminal may send, to a network device, a first RS that occupies a plurality of frequency domain resource segments in one time domain unit, where the plurality of frequency domain resource segments are discontinuously distributed on a frequency band of the terminal, and the network device receives the first RS on a corresponding frequency domain resource segment, and measures CSI based on the first RS. Currently, to avoid channel aging, a method is to shorten an SRS periodicity. Because frequency domain resources occupied by the SRS are continuously distributed on an entire frequency band, this method leads to a waste of time-frequency resources. However, the first RS in this application is discontinuously distributed on a frequency band of the terminal, and a relatively small quantity of time-frequency resources are occupied.

What is claimed is: 
     
       1. A channel state information (CSI) measurement apparatus, comprising:
 a memory configured to store computer-executable instructions; and 
 a processor connected to the memory, wherein the processor is configured to execute the computer-executable instructions to perform operations for:
 receiving a first reference signal (RS) sent by a terminal, wherein the first RS is configured for measuring CSI; the first RS occupies n frequency domain resource segments in a time domain unit, and the n frequency domain resource segments are discontinuously distributed on a frequency band of the terminal; and the time domain unit includes a plurality of consecutive orthogonal frequency division multiplexing (OFDM) symbols, and n is an integer greater than 1; and 
 measuring the CSI based on the first RS; 
 wherein there are n−1 frequency domain resource segment spacings between the n frequency domain resource segments, the frequency domain resource segment spacing is a spacing between two adjacent frequency domain resource segments of the n frequency domain resource segments. 
 
 
     
     
       2. The apparatus according to  claim 1 , wherein the processor is further configured to perform operations for:
 sending configuration information to the terminal, wherein the configuration information is used to configure a sequence carried on each of the n frequency domain resource segments or a time-frequency resource occupied by each of the n frequency domain resource segments, and the time-frequency resource comprises a time domain resource and a frequency domain resource. 
 
     
     
       3. The apparatus according to  claim 1 , wherein the processor is further configured to perform operations for:
 receiving a second RS from the terminal, wherein the second RS is configured for measuring the CSI, and at least some of antenna ports that are of the terminal and that correspond to RS ports comprised in the second RS are the same as antenna ports that are of the terminal and that correspond to RS ports that transmit the first RS; and 
 wherein the measuring the CSI based on the first CSI includes measuring the CSI based on the first RS and the second RS. 
 
     
     
       4. The apparatus according to  claim 1 , wherein quantities of frequency domain units in any two of the n frequency domain resource segments are the same, or the quantities of frequency domain units in at least two of the n frequency domain resource segments are different. 
     
     
       5. The apparatus according to  claim 1 , wherein quantities of frequency domain units in any two adjacent frequency domain resource segment spacings of the n−1 frequency domain resource segment spacings are the same, or the quantities of frequency domain units of at least two of the n−1 frequency domain resource segment spacings are different. 
     
     
       6. The apparatus according to  claim 1 , wherein the n frequency domain resource segments are located on one or more OFDM symbols in the last m OFDM symbols of the plurality of consecutive OFDM symbols in the time domain unit, and m is an integer greater than 0 and less than or equal to 14. 
     
     
       7. The apparatus according to  claim 1 , wherein the apparatus includes a network device, a chip, or a chip system. 
     
     
       8. A channel state information (CSI) measurement method, comprising:
 determining a first reference signal (RS), wherein the first RS is configured for measuring CSI; and 
 sending the first RS to a network device, wherein the first RS occupies n frequency domain resource segments in a time domain unit, and the n frequency domain resource segments are discontinuously distributed on a frequency band of a terminal; and the time domain unit includes a plurality of consecutive orthogonal frequency division multiplexing (OFDM) symbols, and n is an integer greater than 1; 
 wherein there are n−1 frequency domain resource segment spacings between the n frequency domain resource segments, the frequency domain resource segment spacing is a spacing between two adjacent frequency domain resource segments of the n frequency domain resource segments. 
 
     
     
       9. The method according to  claim 8 , wherein the method further comprises:
 receiving configuration information from the network device, wherein the configuration information configures a sequence carried on each of the n frequency domain resource segments or a time-frequency resource occupied by each of the n frequency domain resource segments, and the time-frequency resource comprises a time domain resource and a frequency domain resource; and 
 the sending the first RS to a network device comprises: sending the first RS to the network device based on the configuration information. 
 
     
     
       10. The method according to  claim 8 , wherein the method further comprises:
 sending a second RS to the network device, wherein the second RS is configured for measuring the CSI, and at least some of antenna ports that are of the terminal and that correspond to RS ports that transmit the second RS are the same as antenna ports that are of the terminal and that correspond to RS ports that transmit the first RS. 
 
     
     
       11. The method according to  claim 8 , wherein quantities of frequency domain units in any two of the n frequency domain resource segments are the same, or the quantities of frequency domain units in at least two of the n frequency domain resource segments are different. 
     
     
       12. The method according to  claim 8 , wherein quantities of frequency domain units in any two adjacent frequency domain resource segment spacings of the n−1 frequency domain resource segment spacings are the same, or the quantities of frequency domain units in at least two of the n−1 frequency domain resource segment spacings are different. 
     
     
       13. The method according to  claim 8 , wherein the n frequency domain resource segments are located on one or more OFDM symbols in the last m OFDM symbols of the plurality of consecutive OFDM symbols in the time domain unit, and m is an integer greater than 0 and less than or equal to 14. 
     
     
       14. A channel state information (CSI) measurement apparatus, comprising:
 a memory configured to store computer-executable instructions; and 
 a processor connected to the memory, wherein the processor is configured to execute the computer-executable instructions to perform operations for:
 determining a first reference signal (RS), wherein the first RS is configured for measuring CSI; and 
 sending the first RS to a network device, wherein the first RS occupies n frequency domain resource segments in a time domain unit, and the n frequency domain resource segments are discontinuously distributed on a frequency band of a terminal; and the time domain unit includes a plurality of consecutive orthogonal frequency division multiplexing (OFDM) symbols, and n is an integer greater than 1; 
 wherein there are n−1 frequency domain resource segment spacings between the n frequency domain resource segments, the frequency domain resource segment spacing is a spacing between two adjacent frequency domain resource segments of the n frequency domain resource segments. 
 
 
     
     
       15. The apparatus according to  claim 14 , wherein the processor is further configured to perform operations for:
 receiving configuration information from the network device, wherein the configuration information configures a sequence carried on each of the n frequency domain resource segments or a time-frequency resource occupied by each of the n frequency domain resource segments, and the time-frequency resource comprises a time domain resource and a frequency domain resource; and 
 the sending the first RS to a network device includes: sending the first RS to the network device based on the configuration information. 
 
     
     
       16. The apparatus according to  claim 14 , wherein the processor is further configured to perform operations for:
 sending a second RS to the network device, wherein the second RS is configured for measuring the CSI, and at least some of antenna ports that are of the terminal and that correspond to RS ports comprised in the second RS are the same as antenna ports that are of the terminal and that correspond to RS ports comprised in that transmit the first RS. 
 
     
     
       17. The apparatus according to  claim 14 , wherein quantities of frequency domain units in any two of the n frequency domain resource segments are the same, or the quantities of frequency domain units in at least two of the n frequency domain resource segments are different. 
     
     
       18. The apparatus according to  claim 14 , wherein quantities of frequency domain units comprised in any two adjacent frequency domain resource segment spacings of the n−1 frequency domain resource segment spacings are the same, or the quantities of frequency domain units in at least two of the n−1 frequency domain resource segment spacings are different. 
     
     
       19. The apparatus according to  claim 14 , wherein the n frequency domain resource segments are located on one or more OFDM symbols in the last m OFDM symbols of the plurality of consecutive OFDM symbols in the time domain unit, and m is an integer greater than 0 and less than or equal to 14. 
     
     
       20. The apparatus according to  claim 14 , wherein the apparatus includes a terminal device, a chip, or a chip system.